wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-07-05 04:01:47 +02:00
Code Activity

Start factoring out Unix assumptions

Browse source 
This splits files and adds new identifiers in preperation for supporting
windows, but no Windows-specific code is actually added yet.

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
This commit is contained in:
John Ericson 2024-03-29 15:59:14 -04:00
parent 852391765d
commit 02fa20622f
34 changed files with 352 additions and 296 deletions
Download patch file Download diff file Expand all files Collapse all files

66
src/libutil/unix/users.cc Normal file
View file

@ -0,0 +1,66 @@
#include "util.hh"
#include "users.hh"
#include "environment-variables.hh"
#include "file-system.hh"
#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>
namespace nix {
std::string getUserName()
{
auto pw = getpwuid(geteuid());
std::string name = pw ? pw->pw_name : getEnv("USER").value_or("");
if (name.empty())
throw Error("cannot figure out user name");
return name;
}
Path getHomeOf(uid_t userId)
{
std::vector<char> buf(16384);
struct passwd pwbuf;
struct passwd * pw;
if (getpwuid_r(userId, &pwbuf, buf.data(), buf.size(), &pw) != 0
|| !pw || !pw->pw_dir || !pw->pw_dir[0])
throw Error("cannot determine user's home directory");
return pw->pw_dir;
}
Path getHome()
{
static Path homeDir = []()
{
std::optional<std::string> unownedUserHomeDir = {};
auto homeDir = getEnv("HOME");
if (homeDir) {
// Only use $HOME if doesn't exist or is owned by the current user.
struct stat st;
int result = stat(homeDir->c_str(), &st);
if (result != 0) {
if (errno != ENOENT) {
warn("couldn't stat $HOME ('%s') for reason other than not existing ('%d'), falling back to the one defined in the 'passwd' file", *homeDir, errno);
homeDir.reset();
}
} else if (st.st_uid != geteuid()) {
unownedUserHomeDir.swap(homeDir);
}
}
if (!homeDir) {
homeDir = getHomeOf(geteuid());
if (unownedUserHomeDir.has_value() && unownedUserHomeDir != homeDir) {
warn("$HOME ('%s') is not owned by you, falling back to the one defined in the 'passwd' file ('%s')", *unownedUserHomeDir, *homeDir);
}
}
return *homeDir;
}();
return homeDir;
}
bool isRootUser() {
return getuid() == 0;
}
}